//
//  AppDelegate.swift
//  页面通信
//
//  Created by lanou on 16/11/7.
//  Copyright (c) 2016年 lanou. All rights reserved.
//

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
//可选类型不能直接参与运算，运算需要强制解包（！：强制解包？：判断是否有值，有解包）
    var window: UIWindow?


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
//        改变根视图
//        系统默认初始化一个视图控制器
        let vc = ViewController()
//        实例化一个导航视图控制器（管理控制器的控制器）,根视图控制器传进去（必须有根视图控制器才能跳转）
        let  navc = UINavigationController(rootViewController: vc)
        window = UIWindow(frame: UIScreen.mainScreen().bounds)
//        把窗口设置为白色
        window?.backgroundColor = UIColor.whiteColor()
        window?.rootViewController = navc
//        设置窗口可视
        window?.makeKeyAndVisible()
        return true
    }

    func applicationWillResignActive(application: UIApplication) {
        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
        // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
    }

    func applicationDidEnterBackground(application: UIApplication) {
        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
    }

    func applicationWillEnterForeground(application: UIApplication) {
        // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
    }

    func applicationDidBecomeActive(application: UIApplication) {
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    }

    func applicationWillTerminate(application: UIApplication) {
        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
    }


}

